<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	</body>
</html>
<script>
	
	let email = 'xiao_ming@qq.com';
	
	let re = /[A-Za-z0-9]+@[a-z0-9]+\.com/g;
	
	console.log(re.test(email));
	
</script>